Differential refractometer

Details Differential refractometer Differential refractometer

1993-04-01

1995-03-14

Evans, F. L.

Optics: measuring and testing

Refraction testing

Differential

G01N 2141

Patent

active

053981103

ABSTRACT:
In order to satisfy both of high-sensitivity and low-sensitivity applications with no replacement of a flow cell, a photodetector (30) is divided into four portions (44-1, 44-2, 44-3, 44-4) by a first straight line (40) which is perpendicular to a direction of movement of a slit image (6) and a second straight line (42) which is inclined with respect to the direction of movement of the slit image (6) to intersect with the first straight line (40). Assuming that S.sub.1, S.sub.2, S.sub.3 and S.sub.4 represent intensity levels of detection signals of the photodetector portions respectively, the signals are processed along the following equations in analysis and preparative modes respectively:

REFERENCES:
patent: 3674373 (1972-07-01), Waters et al.

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